The lifetime of mechanical carbon sealing rings fitted into crude petroleum oil pumps can be increased by a factor of 43 by multiple impregnation with coal tar pitch. For single impregnation, epoxy resin yielded the largest improvement. The results were interpreted on the premise that properties such as viscosity, adhesion forces, and coking value determine the effectiveness of the impregnant. The proper selection of the impregnant and procedure of impregnation is dependent on the pumping pressure and oil properties.
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References
1.
WatanabeN.Graphite fluoride-containing solid materials. Japan Kokkai, 77, 58 722 (Cl. C04B41/04), 14 May 1977.
DmitrievaG. V.ApalKovaRyssM. A.Graphitized electrodes. USSR Patent 551412, 25 Mar. 1977.
11.
RabahM. A.AbdulAzim A. A.IsmailA.The role of impregnants in determining the behaviour of graphite anodes. J. Appl. Electrochem., 1981, 11, 49.
12.
GrahamL. W.WattW.JohnsonW.ArragonP. A. P.PriceM. S. T.Development of low permeability graphite for the Dragon Reactor experiment. Proc. Fifth Conf. on Carbon, Pergamon Press, Oxford, 1963, p 387.
13.
RabahM. A.AbdulAzim A. A.TawilS. Z.Carbon products from high sulphur coke. J. Fuel Heat Technol., (in press).
14.
WiggsP. K. C.Relation between gas permeability and pore size distribution in consolidated bodies. Indust. carbon and graphite papers, Chem. Soc.London, 1958, p 253.
15.
WalkerP. L.RusinkoF.RaatsE.Changes of macropore distribution in carbon rods. J. Phys. Chem., 1955, 59, 245.
16.
DubininM. M.The porous structure and adsorption properties of active carbon. Indust. carbon and graphite papers, Chem. Soc.London, 1958, p 219.
17.
RitterH. C.DrakeR. L.Pore size distribution in porous materials. Ind. Eng. Chem. Annul. Ed., 1945, 17, 782.
18.
WalkerP. L.Jr.BaumachD. O.Infrared absorption at 2-μ and coaltar pitch properties. Proc. of Fifth Conf. on Carbon, Pergamon Press, Oxford, 1963, 175.
19.
RabahM. A.AbdulAzim A. A.TawilS. Z.Carbon and electrographitized bodies from high sulphur petroleum coke. Second Met. Conf. Helwan, Egypt, 18 Dec. 1978.
20.
SavageR. H.Graphite lubrication. J. Appl. Phys., 1948, 19, 1.
